So by that logic will the xxxD and xxxxD cameras be rebranded as 8D and 9D ranges to prevent confusion with Nikon as well?
Not likely, for one thing it's only in Europe that they are xxxD and xxxxD, in the states they are all Rebels, and in Japan they are the KISS series. If any change was made it would probably be creating a similar brand name for the European market.
Can't see why they'd change the naming structure as they've used the same one since the start of the EOS range.
I don't think it's been as constant as you seem to believe. Go back and look at the pre-digital EOS cameras. Even the xxD line started as Dxx.